Choose a differential equation using the [v] popdown menu.
Position the cursor arrow over the graphing window to display
coordinates. Depress the mousekey over the graphing window to display
a solution with that initial condition. The solution can be dragged by
moving the cursor with the mousekey depressed. Releasing it will leave
the solution in place.
The slope field can be set at bright, dim, or off, using the [Slope
field] box.
Grab the [m] slider to display the corresponding isoclines. Release
the slider to leave the isocline on the graphing window.
Clear solutions, isoclines, or both, using the keys at bottom.
This is an adaptation of the Isocline tool in "Interactive
Differential Equations," IDE, an Addison Wesley product created
by Hohn, Cantwell, West, McDill, and Strogatz.